使矩形透明 [英] Make Rectangle transparent

问题描述

我需要使绘制的矩形鼠标透明，以查看桌面. 以下代码绘制了我的矩形.我该添加些什么? 感谢您的帮助

I need to make a drawn rectangle mouse transparent, in order to see the desktop. The following code draws my rectangle. What should I add to get that ? Thanks for help

public void start(Stage primaryStage) {
    Group group = new Group();

    Rectangle rect = new Rectangle(20,20,200,200);

    rect.setArcHeight(15);
    rect.setArcWidth(15);

    rect.setStroke(Color.BLACK);
    group.getChildren().add(rect);

    Scene scene = new Scene(group, 300, 200);
    primaryStage.setScene(scene);
    primaryStage.show();
}

推荐答案

由于JavaFX中的屏幕图是分层结构，要显示桌面，还需要使Stage和Scene透明，并使用形状算术":

Since the screen graph in JavaFX is in a hierarchical structure, to show desktop you need to also make the Stage and Scene transparent, and use shape "arithmetic":

@Override
public void start(Stage stage) {
    Group group = new Group();
    Rectangle rect = new Rectangle(0, 0, 350, 300);
    Rectangle clip = new Rectangle(20, 20, 200, 200);
    clip.setArcHeight(15);
    clip.setArcWidth(15);

    Shape shape = Shape.subtract(rect, clip);

    shape.setFill(Color.GRAY);
    group.getChildren().add(shape);
    Scene scene = new Scene(group);
    scene.setFill(Color.TRANSPARENT);
    stage.initStyle(StageStyle.TRANSPARENT);
    stage.setScene(scene);
    stage.show();
}

稍后，您可以将可拖动功能添加到窗格/组.

Later you can add draggable feature to the pane/group.

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